Fix "unused variable" warnings.

chrome/browser/chromeos/policy/consumer_unenrollment_handler.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_POLICY_CONSUMER_UNENROLLMENT_HANDLER_H_
 #define CHROME_BROWSER_CHROMEOS_POLICY_CONSUMER_UNENROLLMENT_HANDLER_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "components/keyed_service/core/keyed_service.h"
 
 namespace chromeos {
-class DeviceSettingsService;
 class OwnerSettingsServiceChromeOS;
 }
 
 namespace policy {
 
 class ConsumerManagementService;
 class DeviceCloudPolicyManagerChromeOS;
 
 // ConsumerUnenrollmentHandler unenrolls the device from the consumer management
 // service. It sends a request to the server and resets the management settings.
 class ConsumerUnenrollmentHandler : public KeyedService {
  public:
   ConsumerUnenrollmentHandler(
-      chromeos::DeviceSettingsService* device_settings_service,
       ConsumerManagementService* consumer_management_service,
       DeviceCloudPolicyManagerChromeOS* device_cloud_policy_manager,
       chromeos::OwnerSettingsServiceChromeOS* owner_settings_service);
   ~ConsumerUnenrollmentHandler() override;
 
   // Starts the unenrollment process.
   void Start();
 
  private:
   void OnUnregistered(bool success);
   void OnManagementSettingsSet(bool success);
 
-  chromeos::DeviceSettingsService* device_settings_service_;
   ConsumerManagementService* consumer_management_service_;
   DeviceCloudPolicyManagerChromeOS* device_cloud_policy_manager_;
   chromeos::OwnerSettingsServiceChromeOS* owner_settings_service_;
 
   base::WeakPtrFactory<ConsumerUnenrollmentHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ConsumerUnenrollmentHandler);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_CHROMEOS_POLICY_CONSUMER_UNENROLLMENT_HANDLER_H_